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<title>Using MRAN Binaries</title>

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<h1 class="title toc-ignore">Using MRAN Binaries</h1>



<p>When working on macOS and Windows, users will often download and install package binaries, rather than sources, as provided by CRAN. However, CRAN only provides binaries for the latest-available version of a package, and so binaries for older versions of a package will become inaccessible as that package is updated.</p>
<p><a href="https://mran.microsoft.com/">MRAN</a> is a service provided by Microsoft that mirrors CRAN every day, and allows users to use particular snapshots of CRAN as their active repositories within their R session.</p>
<p>Starting with <code>renv 0.10.0</code>, <code>renv</code> can also make use of MRAN binary packages when restoring packages on Windows and macOS. When invoking <code>renv::install()</code> or <code>renv::restore()</code>, <code>renv</code> will attempt to install the package from the latest-available MRAN snapshot that still had this package available.</p>
<p>As an example, the <code>stringi</code> package was updated from version <code>1.4.5</code> to version <code>1.4.6</code> on 2020-02-17, and binaries for that version of <code>stringi</code> were made available for macOS on 2020-02-20. Because of this, the last date on which <code>stringi 1.4.5</code> macOS binaries were available on CRAN was <code>2020-02-19</code>.</p>
<p>Fortunately, because MRAN snapshotted CRAN on this date, we can retrieve that binary. For example, on macOS with R 3.6:</p>
<div class="sourceCode" id="cb1"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="sc">&gt;</span> renv<span class="sc">::</span><span class="fu">install</span>(<span class="st">&quot;stringi@1.4.5&quot;</span>)</span>
<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a>Retrieving <span class="st">&#39;https://mran.microsoft.com/snapshot/2020-02-19/bin/macosx/el-capitan/contrib/3.6/stringi_1.4.5.tgz&#39;</span> ...</span>
<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a>    OK [file is up to date]</span>
<span id="cb1-4"><a href="#cb1-4" aria-hidden="true" tabindex="-1"></a>Installing stringi [<span class="dv">1</span>.<span class="fl">4.5</span>] ...</span>
<span id="cb1-5"><a href="#cb1-5" aria-hidden="true" tabindex="-1"></a>    OK [installed binary]</span></code></pre></div>
<p>When binaries are available from MRAN, <code>renv</code> should transparently download and use them when possible. When binaries are not available, <code>renv</code> will fall back to the old behavior, and attempt to install packages from sources.</p>
<p>If you prefer not to make use of MRAN (e.g. because you are using <code>renv</code> in an environment without external internet access), you can disable it with:</p>
<pre><code>options(renv.config.mran.enabled = FALSE)</code></pre>
<p>See also the <code>?renv::equip</code> function, which can assist you in preparing your environment for compilation of packages.</p>



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